1. Anhui Provincial Center for Disease Control and Prevention, Hefei, China;
2. Lu’an Municipal Center for Disease Control and Prevention, Lu’an, China;
3. Anqing Municipal Center for Disease Control and Prevention, Anqing, China;
4. Chuzhou Municipal Center for Disease Control and Prevention, Chuzhou, China;
5. Xuancheng Municipal Center for Disease Control and Prevention, Xuancheng, China